In all practical aspects, the Walkera 4in1 is cheaper in quality than the GWS one, but it works alot better.

Unfortunately, to use the receiver, as far as i'm aware, it uses propieraty technology, and so will only work with a Walkera transmitter. It was an easy fix for me since I already had a Walkera TX from my original Walkera #4 Dragonfly. It also has no gain or mix adjustments, so if you get wagging on your tail, well, theres not a whole lot you can do about it.

I would suggest looking at either getting a seperate gyro/mixer/speed control setup, or look into the 3in1's made by other companies. You can also try contacting GWS, maybe they'll send you a replacement, maybe they've fixed the problem, I don't know. I'm usually very happy with GWS products, but their 3in1 is just terrible. Helihobby carries a few 3in1 boards from other companies, they're not as cheap as the GWS 3in1, but i'm sure they work a whole lot better.

If you're still interested in the route I used with a Walkera 4in1, any online parts retailer who carries parts of the Walkera #4 Dragonfly should have the 4in1 box. It's usually about $30 USD I think. You could also buy the Transmitter for $30. www.rc-expert.com carries them, but they're a bit slow on the shipping. I usually get mine from various sellers on ebay.